Thanks for commenting the difference, but what would happen when people use rational thinking only to construct excuses, that is rationalization of what they do.

An example: I am a rational people, I will pick certain portion of reality that allow me to construct a good model of myself, with blind eyes for the part I don't want to see.

You can use "rational thinking" to construct rationalization of your behaviour.

Since there is no logical notion of justice, rational thinking and rationalization are not far away.